共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
用双喷嘴坩埚制备了非晶态合金Fe78Si9B13和(FeNiCr)78(SiB)22的单层带材和复合带,并测量了两种合金的叠绕铁蕊和复合带铁蕊的热磁曲线和磁滞回线.对于两种合金的叠绕铁蕊,其磁滞回线呈峰腰型,类似于两种合金各自磁滞架线的平均值,但并不完全相同.对于复合带铁芯,其热磁曲线与两种合金热磁曲线的平均值基本重合,而磁滞回线不仅不再是蜂腰型,且非常扁平.叠绕铁芯和复合带铁芯磁滞回线的这种变化源于叠绕铁芯和复合带铁芯中的内应力.这种内应力产生的根本原因是两种材料热膨胀系数和磁致伸缩系数的差别.
关键词: 相似文献
6.
7.
8.
测量了居里点TC=36 0K的钙钛矿La0 6 7Pb0 33MnO3在 2K 相似文献
9.
10.
11.
12.
采用粘合法制备了叠层结构的块体Terfenol-D/PZT磁电复合材料,测量了不同频率下的磁电回线,采用新的极坐标下的方式做图.从极坐标下的磁电回线中可以看出,随直流磁场的变化,非谐振频率下的磁电相位发生了轻微移动,移动幅度随频率的增加而增加;而在谐振频率下,伴随着巨磁电效应,磁电相位发生了显著移动,移动幅度达到了近90°.与粉末Terfenol-D/环氧树脂/PZT磁电复合材料对比之后表明,非谐振频率下块体Terfenol-D/PZT的磁电相位移动主要由涡流引起;而谐振频率下大幅度相位移动则主要来源于Terfenol-D的磁致弹性变化. 相似文献
13.
Akane Agui Hiroshi Sakurai Takuro Tamura Toshitaka Kurachi Masahito Tanaka Hiromichi Adachi Hiroshi Kawata 《Journal of synchrotron radiation》2010,17(3):321-324
An application of magnetic Compton scattering as a new tool to measure a spin‐specific magnetic hysteresis (SSMH) loop is introduced and its validity demonstrated. The applied magnetic field dependence of the integrated intensity of magnetic Compton scattering spectra, which reflect only the spin‐dependent magnetic properties of magnetically active electrons, was interpreted as the spin‐specific hysteresis. The spin magnetization of amorphous Tb33Co67 film was observed and its SSMH loop exhibited qualitative agreement with the ordinal magnetic hysteresis loop measured using a conventional vibrating sample magnetometer. 相似文献
14.
P. Q. Zhao J. Y. Fan H. T. Xue 《Applied Physics A: Materials Science & Processing》2009,97(2):277-280
Silica-coated Mn-doped CdS nanocrystals were synthesized by use of a reverse-micelle method. Transmission electron microscopy,
X-ray diffraction and electron paramagnetic resonance were adopted to characterize the samples, and their magnetic properties
were studied via superconducting quantum interference device magnetometry. The samples exhibit anomalous ferromagnetic property
at low temperature. The CdS: Mn nanocrystals dispersed in a silica matrix exhibit an obvious hysteresis loop shift toward
the direction of the magnetic field; by contrast, the nanocrystals coated with compact SiO2 shell layers display a symmetric hysteresis loop. The shell layers are supposed to be responsible for the distinct magnetic
behaviors. 相似文献
15.
铁基非晶磁环磁开关设计 总被引:2,自引:1,他引:1
分析了磁开关的工作原理及其工作过程进行了分析,推导了磁开关磁芯体积公式,给出了多级磁脉冲压缩电路所需的条件,使用Pspice对磁开关的工作过程进行了模拟。根据理论分析和数值模拟的结果,设计了一台10 kV级,压缩比为8.3的磁开关,并在实验中将10 kV,9.2μs的脉冲压缩为10 kV,1.3μs的脉冲。针对该实验平台设计了一种便捷的磁芯动态磁滞回线测试方法,运用该方法不需搭建测试平台,直接在单级磁脉冲压缩电路平台上即可完成磁芯参数的测量和磁滞回线的绘制。 相似文献
16.
《中国物理 B》2015,(6)
This paper reports an approach to obtaining multiferroic properties in co-doped(Zn:Mn) Ba Ti O3 near room temperature.Interestingly,an unusual magnetic hysteresis loop is observed in the co-doped compositions in which the central portion of the loop is squeezed.However,in the composition Ba0.9Zn0.1Ti0.9Mn0.1O3,a broad magnetic hysteresis loop is observed.Such a magnetic effect is attributed to the coexistence of antiferromagnetic and ferromagnetic exchange interactions in the system.The observation of the above type of magnetic properties is likely to be due to the presence of exchange interactions between Mn ions.A lossy-type of ferroelectric hysteresis loop is also observed in co-doped ceramic compositions near room temperature. 相似文献
17.
磁开关是磁脉冲压缩系统的关键部分,磁开关的磁芯性能参数直接影响到磁脉冲压缩系统的总体性能。针对磁脉冲压缩系统中磁开关磁芯应用特性,设计了回路振荡法对磁芯动态磁特性进行测量。通过测量磁开关工作电压和电流参数,计算磁芯的动态磁滞回线,确定饱和磁感应强度、矫顽力等动态参数。基于实验测量参数建立了包含动态磁滞回线的磁脉冲压缩电路模型,研究了磁开关动态特性对电压传递的影响。根据研究结果可得,在磁脉冲压缩系统设计中选择矫顽力较小的磁芯,可降低磁开关的能量损耗,从而保证系统具有较高的电压传递效率。 相似文献
18.
The magnetic properties, such as initial permeability and hysteresis loop properties of the chromium substituted Li–Sb ferrite system have been investigated. The SEM micrographs reveal the microstructure of the samples. The initial permeability is observed to decrease with the increase of chromium concentration. Frequency variation of permeability indicates that for all samples the resonance peak due to domain wall oscillations is at a frequency above 15 MHz. The hysteresis loop parameters have been calculated from the hysteresis loop studies. The magnetic parameters are observed to decrease with higher level of substitution. 相似文献
19.
The exchange coupling at the interfaces of magnetic superlattices consisting
of ferromagnetic SrRuO3 and antiferromagnetic SrMnO3 grown on (001)
oriented SrTiO3 is studied with in-plane and out-of-plane orientations of the cooling magnetic field,
with respect to the substrate plane. The
magnetization of the in-plane, field cooled hysteresis loop is lower than
the corresponding in-plane zero-field-cooled hysteresis loop. The
out-of-plane field cooled hysteresis loop is shifted, from the origin, along
the graphical magnetization axis. We attribute this irreversible rotation of
the moment to the pinning/biasing of spin in the SrRuO3 layer in the
vicinity of interfaces by the antiferromagnetic SrMnO3 layer. 相似文献
20.
WUYin-Zhong LIZhen-Ya 《理论物理通讯》2002,37(2):243-246
Zero-temperature Monte Carlo simulations are used to investigate the hysteresis of a magnetic particle in a dipolar Ising model.The magnetic particle is described in a systemm of permanent dipoles,and the dipoles are located in a cubic lattice site.The effects of the shape and the size of the particle on the hysteresis loop at zero temperature are obtained.For strong exchange interactions,the shapes of magnetic hysteresis loops approach rectangle.For weak exchange interactions,the effects of the size and the shape of the particle on the loops are more remarkable than those of strong exchange interactions case.The slope of the hysteresis loop decreases with the increase of the ratio of the semi major axis to the semi minor axis of the ellipsoidal magnetic particle,and there is an increase of the slope of the hysteresis with the decrease of the size of the magnetic particle.The effects of the shape and size of the particle on the coercive force at zero temperature are also investigated. 相似文献